The Long-billed Sunbird is a small sunbird with a long, downcurved bill. It occurs in farmland, moist forest, and scrub in India and Sri Lanka.
Its bill is long and deeply curved. The glossy purple male is larger and longer-billed than the similar Purple Sunbird. The female has dark grey upperparts and sharply defined white underparts.
It uses farmland, moist tropical forest, and humid scrub. During breeding, the female usually lays two eggs, which are incubated for about 15 days.
An extinction-risk assessment has not been added yet.